YouTube is experimenting with 4K videos running at 60 frames per second. Only six videos are available in the new format so far, and you'll need a powerful computer and a fast Internet connection to be able to watch them.

At its F8 developer conference, Facebook announced new features to let businesses interact with customers on its Messenger app. Facebook is also opening Messenger to developers, so they can create companion apps.

Samsung and Microsoft announced the companies are expanding their partnership to include extra Microsoft features on the Android maker's devices, but now users can do something new with their devices, delete stuff.